KR20050000985A - Image Modification Structure of Projection TV - Google Patents

Abstract

PURPOSE: A structure for correcting a screen of a projection TV(Television) is provided to reduce the number of components and weight and realize design of a slimmed figure by adopting a simple structure such that a reflection angle of a mirror is adjusted in correction of the screen. CONSTITUTION: A ray of light that includes a video signal is projected to a mirror(120) and reflected by a screen. The mirror is fixed by a separate fixing member. The fixing member is supported by a back cover(110). The fixing member is moved forward and backward by a separate adjusting member at the outside of the back cover and thereby a reflection angle is adjusted so that distortion of the screen can be corrected.

Description

Image Modification Structure of Projection TV

The present invention relates to a screen correction structure of a projection TV. In particular, it is possible to correct screen distortion such as tilt, keystone, trap joydal, pin cushion, barrel, etc., displayed on the screen of the projection TV by adjusting the reflection angle of the mirror. A screen correction structure of a projection TV.

In general, a projection TV can be divided into a CRT projection TV and an LCD projection TV according to the driving elements. The CRT projection TV has three single color (R, G, B) cathode ray tubes (CRT). Although the video signal is generated by the LCD projection, the video signal is generated by the optical engine (lighting system + color system + projection lens system).

FIG. 1 is a schematic cross-sectional view showing a structure of a general LCD projection TV. The general LCD projection TV as shown in the drawing includes an optical engine 30 for generating and projecting light including an image signal, and an optical engine ( 30 is a mirror 20 to reflect the light generated in the 30, and the screen 40 to form an image by the light reflected from the mirror (20).

Here, the front cover 30 supporting the mirror 10 and the screen 40 is coupled to the back cover 10, the optical engine 50 is coupled to the cabinet 60 to form a bottom portion. .

LCD projection TV composed of the above configuration is mainly made of a large screen, the back cover 10, etc. are made of a large injection molding, such a large injection molding is easily deformed according to the injection conditions and working environment, furthermore The mounting position of the optical engine 50 and the mirror 20 is affected.

This is due to the fact that the light including the image signal forms a long optical path passing through the optical engine 50 and the mirror 20 to the screen 40, so that the optical engine 50 and the mirror 20 It can be seen that a small change in position leads directly to serious problems such as screen distortion on the screen 40.

Such screen distortion may include a tilt phenomenon caused by the entire tilt of the optical engine and a keystone phenomenon caused by a change in the optical path TCL due to a different angle of projection of the optical engine or a different mirror angle. 2 (a) is a front view showing the tilt phenomenon on the screen, (b) is a front view showing the keystone phenomenon on the screen.

In particular, such a problem is inevitably caused in the case of a projection TV in which a large number of parts are assembled and used, and this problem is a factor that degrades the quality of the projection TV.

For this reason, when the production of the product, a separate adjustment means for adjusting the tilt and keystone phenomenon after the assembly process is required for the stabilization of production and the stabilization of quality was required.

Accordingly, in an effort to correct the screen distortion phenomenon as described above, conventionally, a separate optical engine adjusting device for adjusting the position of the optical engine 50 as shown in FIGS. 3 to 5 has been proposed.

3 is a perspective view of an LCD projection TV equipped with a conventional optical engine adjusting device, and as shown in the drawing, an operation for operating the optical engine 50 on the front cover 30 of the conventional LCD projection TV. Means 31 are formed.

The position of the optical engine 50, which has a significant influence on the screen quality projected on the screen by the operation means 31, can be changed up, down, left, and right.

4 is a plan view showing a state in which the optical engine is rotated by the conventional optical engine adjusting device, Figure 5 is a front view showing a state in which the optical engine is height-adjusted by the conventional optical engine adjusting device.

As shown in the figure, in the conventional LCD projection TV, an optical engine 50 is mounted on the engine base 51, and the engine base 51 is supported on the base panel 53 by a separate optical engine adjusting device. It is fixed, and the base panel 53 is fixed on the cabinet 60 forming the bottom of the TV.

Here, the adjusting device is composed of a rotation adjusting structure and a height adjusting structure. When the rotation adjusting structure is described first, the rear center of the engine base 51 on which the optical engine 50 is mounted is rotated as shown in FIG. 4. It is fixed by 55, and the front left and right ends of the engine base 51 are supported by the height adjustment shaft 57, respectively.

In this case, a long hole hole (not shown) is formed on a circular arc centered on the rotary shaft 55 at the front left and right ends to which the height adjustment shaft 57 is coupled, and the engine base 51 rotates as much as the hole hole range. The rotation is adjusted around the center.

And, looking at the height adjustment structure of the optical engine 50, a predetermined length of the upper portion of the height adjustment shaft 57 is formed of a thread, and as the transfer member is fastened up and down by the screw thread is supported by the transfer member It is a structure that can adjust the height of the engine base 51 being.

In this case, the height adjustment shaft 57 is formed on the left and right ends of the engine base 51 so as to be adjusted respectively, thereby adjusting the distortion of the screen.

However, the conventional optical engine 50 adjusting device having the above configuration must be provided with an adjusting device between the engine base 51 and the base plate 53, and the structure thereof is not only complicated, Due to the large number of parts required, the addition of an assembly process decreases the work efficiency, which is a major cause of an increase in material costs and manufacturing costs.

In addition, the installation of the optical engine 50 adjusting device according to the prior art requires a lot of installation space, which may affect the design design of the product to make the appearance clunky, the adjusting device and supporting it Since the weight of the engine base 51 and the base plate 53 is considerably heavy, it increases the overall weight of the LCD projection TV and further affects the bottom cabinet 60 or the back cover 10 to cause deformation. Accordingly, there is a problem in that the position of the optical engine 50 or the mirror 20 is changed to further increase the screen distortion phenomenon.

The present invention has been proposed to solve the above problems, and an object of the present invention is to make it possible to correct the screen of the projection TV by a simple structure that adjusts the angle of reflection of the mirror, thereby reducing the number of parts and reducing the weight of the design It is to provide a screen correction structure of a projection TV that allows slimming.

Another object of the present invention is to provide a screen correction structure of a projection TV that the screen adjustment device is formed on the back of the back cover, the operation is simple, and A / S is easy.

Still another object of the present invention is to provide a screen correction structure of a projection TV that can be applied to all image projection devices using a reflection mirror.

1 is a schematic cross-sectional view showing the structure of a conventional LCD projection TV.

Figure 2 (a) is a front view showing a tilt phenomenon on the screen, (b) is a front view showing a keystone phenomenon on the screen.

Figure 3 is a perspective view of the LCD projection TV equipped with a conventional optical engine adjusting device.

4 is a plan view showing a state in which the optical engine is rotated by a conventional optical engine adjusting device.

5 is a front view showing a state in which the optical engine is height-adjusted by a conventional optical engine adjusting device.

6 is an overall perspective view of a projection TV to which the screen correction structure according to the present invention is applied.

Figure 7 is an exploded perspective view showing a screen correction structure according to the present invention.

8 is a perspective view showing a screen correction structure according to the present invention.

* Description of the symbols for the main parts of the drawings *

110: back cover 111: guide member

120: mirror 130: adjusting device

131: holder 131a: coupling groove

131b: guide protrusion 131c: screw

132: spring 133: adjusting member

134: nut cover 135: fastening member

136: louver

In the projection position correction apparatus of the image projection apparatus according to the present invention for achieving the above object is to project the light containing the image signal to the mirror so that the light is reflected on the screen to implement the image,

The mirror is fixed by a separate fixing member, and the fixing member is supported by a back cover, and by using a separate adjusting member on the outside of the back cover, the fixing member is adjusted forward and backward as the reflection angle of the mirror. This adjustment is characterized in that the screen distortion is corrected.

The present invention also includes a mirror for reflecting light containing the image signal to the screen; A holder configured to be coupled to an upper left right side and a lower left right side of the mirror, respectively; A guide member which is formed on the holder backside and is inserted into the guide member and is supported in a slidable state; A back cover on which the guide member is formed; Adjusting member for fastening forward and backward by fastening the screw of the holder protruding to the back cover; Covering the adjustment nut and fastening with a separate fastening member, characterized in that consisting of a configuration including a nut cover for preventing the departure and malfunction of the adjustment member.

Here, the holder is formed with a coupling groove for engaging the mirror at the bottom of the body, guide protrusions protruding a predetermined length to the back of the body are formed on each of the left and right ends, characterized in that the screw is formed in the center of the guide protrusion do.

Herein, the cushion louver is inserted into the inner wall of the coupling groove of the holder, and the mirror is coupled to the coupling groove into which the louver is inserted.

Here, the guide protrusion of the holder is characterized in that the spring is extrapolated and coupled to the guide member.

Here, the guide member is characterized in that each boss is formed so that the guide protrusion and the screw of the holder is inserted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6 is an overall perspective view of a projection TV to which the screen correction structure is applied according to the present invention, FIG. 7 is an exploded perspective view showing the screen correction structure according to the present invention, and FIG. 8 is a combined perspective view showing the screen correction structure according to the present invention.

As shown in the figure, the screen correction structure of the projection TV according to the present invention is coupled to the back cover 110 to adjust the installation angle of the mirror 120 to reflect the projection light on the screen to separate adjustment device 130 By adjusting it through

Referring to the configuration of the present invention as described above, the mirror 120 for reflecting the light containing the image signal to the screen, and the holder to be coupled to the upper left and right and the lower left and right of the mirror 120, respectively ( 131, a guide member 111 formed on the back surface of the holder 131, a guide member 111 supported by a screw 131c in a slidable state, and a back cover on which the guide member 111 is formed. 110, the adjustment member 133 to fasten the back and forth by fastening the holder screw (131c) protruding to the back cover 110, and the adjustment member 133 is covered with a separate fastening member 135 It is made of a configuration including a nut cover 134 for preventing the separation and malfunction of the adjustment member 133 by fastening.

The holder 131 has a coupling groove 131a for coupling the mirror 120 to a lower end of the body, and guide protrusions 131b protruding a predetermined length to the rear surface of the body are formed at left and right ends, respectively, and the guide protrusions. 131b has a configuration in which a screw 131c is formed in the center.

Here, the louver 136 of the cushion material is inserted into the inner wall of the coupling groove 131a of the holder 131, and the mirror 120 is coupled to the coupling groove 131a into which the louver 136 is inserted. This is to prevent the mirror 120 from being broken and to be fixed without moving in the holder 131.

In addition, a spring 132 is extrapolated to the guide protrusion 131b of the holder 131 to be coupled to the guide member 111, thereby restoring force to the holder 131 at all times.

In addition, the guide member 111 forms each boss 111a to insert the guide protrusion 131b and the screw 131c of the holder 131.

Referring to the operation of the present invention made of the above configuration as follows.

The optical path is distorted due to mechanical errors, changes in the mounting position of the optical engine, case deformation, etc., resulting in screen distortion on the screen.

At this time, in the present invention, the adjustment member 133 formed on the back cover 110 is rotated, and the holder 131 moves forward and backward as the adjustment member 133 rotates.

The holder 131 is coupled to the mirror 120 and eventually affects the reflection angle of the mirror 120.

By adjusting the holder 131 which supports the upper left and right and the lower left and right sides of the mirror 120, the screen distortion such as tilt, keystone, trapjoy, pin cushion, barrel, etc. The phenomenon can be corrected.

The screen correction structure of the projection TV according to the present invention has the following effects.

First, the present invention is due to the simple structure, the number of parts and work process is reduced, there is an effect of lowering the manufacturing cost with the slimming of the product.

Second, the present invention has an effect that can be easily A / S because the screen adjustment device is formed on the back cover back.

Third, the present invention has an effect that can be commonly applied to all image projection apparatus using a mirror.

Claims (6)

A projection TV configured to implement an image by projecting light containing an image signal to a mirror so that the light is reflected on a screen. The mirror is fixed by a separate fixing member, and the fixing member is supported by a back cover, and by using a separate adjusting member on the outside of the back cover, the fixing member is adjusted forward and backward as the reflection angle of the mirror. And adjusting the screen distortion so that the screen distortion is corrected. A mirror for reflecting light including an image signal on a screen; A holder configured to be coupled to an upper left right side and a lower left right side of the mirror, respectively; A guide member which is formed on the holder backside and is inserted into the guide member and is supported in a slidable state; A back cover on which the guide member is formed; Adjusting member for fastening forward and backward by fastening the screw of the holder protruding to the back cover; The cover of the projection TV, characterized in that it comprises a nut cover for covering the adjustment member and fastening with a separate fastening member to prevent the departure and malfunction of the adjustment member. The method of claim 2, The holder is formed with a coupling groove for coupling the mirror at the bottom of the body, the guide projections protruding a predetermined length to the rear surface of the body are formed on each of the left and right ends, the projection characterized in that the screw is formed in the center of the guide projection TV's Screen Compensation Structure. The method of claim 3, wherein And a cushion louver inserted into an inner wall of the coupling groove of the holder, and configured to couple a mirror to the coupling groove into which the louver is inserted. The method of claim 2, Screen projection structure of the projection TV, characterized in that the spring is extrapolated to the guide projection of the holder is coupled to the guide member. The method of claim 2, The guide member is a screen correction structure of the projection TV, characterized in that for forming each boss so that the guide projection and the screw of the holder is inserted.